| 摘要 |
PURPOSE:To press down effectively a billet without generating an internal crack in the billet and to prevent central segregation in the stage of drawing continuously the billet while repeating forging by forging dies by specifying the pressing down grade and pressing down cycle of forging. CONSTITUTION:The billet formed by continuous casting is subjected to forward and backward movement in arrow 7, 7' directions by casting molds 6, 6' near the crater ends where the internal molten steel completes solidification, by which the billet is pressed down. The billet is subjected to forging under the conditions of 0.1-40mm./m pressing down grade of forging by the molds 6, 6' and 5-100 times/min pressing down cycle. The area where the thickened molten metal to be a cause for central segregation is sucked is thus pressed down flatly over the entire region and therefore there is a high effect of improving central segregation. |
